🌐 5. Node.js Interview Questions (111–130)
111. What is Node.js?
112. Why use Node.js?
113. What is npm?
114. Difference between CommonJS and ES Modules
115. What is Express.js?
116. What is middleware?
117. What is REST API?
118. Difference between PUT and PATCH
119. What is JWT?
120. What is authentication vs authorization?
121. What is CORS?
122. What is dotenv?
123. What is event loop?
124. What is non-blocking I/O?
125. What is package.json?
126. What is nodemon?
127. What are streams in Node.js?
128. What is buffering?
129. What is async middleware?
130. What is rate limiting?

🗄️ 6. Database Interview Questions (131–150)
131. What is SQL?
132. Difference between SQL and NoSQL
133. What is primary key?
134. What is foreign key?
135. What is normalization?
136. What are joins in SQL?
137. Difference between INNER JOIN and LEFT JOIN
138. What is indexing?
139. What is aggregate function?
140. Difference between DELETE, DROP, and TRUNCATE
141. What is MongoDB?
142. Difference between MongoDB and MySQL
143. What is schema?
144. What is ORM?
145. What is Sequelize?
146. What is Mongoose?
147. What is ACID property?
148. What is transaction?
149. What is database sharding?
150. What is replication?

🔒 7. Web Security Interview Questions (151–165)
151. What is HTTPS?
152. Difference between HTTP and HTTPS
153. What is SSL/TLS?
154. What is XSS attack?
155. What is CSRF attack?
156. What is SQL Injection?
157. How to secure APIs?
158. What is hashing?
159. Difference between encryption and hashing
160. What is bcrypt?
161. What is OAuth?
162. What is JWT token security?
163. What is Content Security Policy?
164. What is brute force attack?
165. What is two-factor authentication?

🚀 8. APIs & Backend Concepts (166–180)
166. What is API?
167. Difference between REST and GraphQL
168. What is RESTful API?
169. What are HTTP status codes?
170. Explain 200, 201, 400, 401, 403, 404, 500
171. What is API testing?
172. What is Postman?
173. What is WebSocket?
174. Difference between polling and WebSocket
175. What is microservice architecture?
176. What is monolithic architecture?
177. What is caching?
178. What is Redis?
179. What is CDN?
180. What is load balancing?

☁️ 9. Deployment & DevOps Questions (181–190)
181. What is Git?
182. Difference between Git and GitHub
183. What is version control?
184. What is branching in Git?
185. What is merge conflict?
186. What is CI/CD?
187. What is Docker?
188. What is Kubernetes?
189. What is cloud hosting?
190. Difference between AWS, Azure, and GCP

🧩 10. Advanced Web Development Questions (191–200)
191. What is Progressive Web App (PWA)?
192. What is service worker?
193. What is lazy loading?
194. What is code splitting?
195. What is tree shaking?
196. What is SSR in Next.js?
197. What is hydration in React?
198. What is Webpack?
199. What is Babel?
200. What is TypeScript and why use it?

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